21-9+12=x-9

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Solution for 21-9+12=x-9 equation:


Simplifying
21 + -9 + 12 = x + -9

Combine like terms: 21 + -9 = 12
12 + 12 = x + -9

Combine like terms: 12 + 12 = 24
24 = x + -9

Reorder the terms:
24 = -9 + x

Solving
24 = -9 + x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1x' to each side of the equation.
24 + -1x = -9 + x + -1x

Combine like terms: x + -1x = 0
24 + -1x = -9 + 0
24 + -1x = -9

Add '-24' to each side of the equation.
24 + -24 + -1x = -9 + -24

Combine like terms: 24 + -24 = 0
0 + -1x = -9 + -24
-1x = -9 + -24

Combine like terms: -9 + -24 = -33
-1x = -33

Divide each side by '-1'.
x = 33

Simplifying
x = 33

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